Once -A special period tracker

Contains adsIn-app purchases
4,4
23,4K reviews
1M+
Downloads
Content rating
Mature 17+
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About this app

For the all women who need menstruation recording calendar
For the all women who need caring dairy for irregular menstrual pain and menstrual cycle
For the all women who want to know the fertility, ovulation, contraception and probability of pregnancy through calendar
For the all women who annoys marking menstruation and contraceptive pill on the calendar every time.
For the all women who secretly record the symptoms of her body on the calendar.

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Must Have! Menstrual cycle management app, Once

[ We fulfill the standard of menstrual cycle management app!]


** Menstrual calendar being more accurate as more as you use!
It smartly calculate your menstrual cycle that was really hard to expect when the menstrual pain will come.
In the menstrual calendar, you can see the expected menstrual date, ovulation day which has high probability of pregnancy, fertility and taking contraceptive pill at a glance,
In the calendar history, you can see menstrual cycle at a glance.


** Taking care of ovulation date and fertility!
You can easily recognize the ovulation date, fertility and expected menstrual date
at a glance, so you can take care of yourself more preciously.


** Scientific calculation of probability of pregnancy!
Based on the ovum survival period for 24 hours and the sperm survival period for 3 to 5 days, the 1 day before and after the ovulation date have high probability of pregnancy. We are displaying the probability of pregnancy as middle in the fertility period.


** The day that needs preparing of body and mind, prepare in advance!
The day, for not to be embarrassed! In the needful situations(expected menstrual date/fertility with high probability of pregnancy / ovulation date etc when you want), they let you know the day in advance with alarm and sensible messages.


** Save my precious every day records simply!
Save your data in more easier and simpler way than diary.

If you sign up, you can store all the data that you record such as menstrual date, loving date, taking contraceptive pill, memo, auto calculated ovulation date and fertility period!
Although you change your smartphone or install the app again after deleting, you can have data back in the menstrual calendar when you log in!


** Not only the menstrual date but also the secret love date!
You can easily record the condition or symptoms of your body, the starting date of menstruation and menstrual pain.

Once will be my secret diary that even can record the secret loving date!
You don't have to worry about that someone will secretly look your diary because it has a lock function.


** Neat and refined design catching women's mind! 'The pretty app is good to see and also good to use' refined and neat design enhanced the usability of the menstrual calendar.
By simple menstrual calendar, you can see the expected menstrual date and fertility at a glance.

Like your cool diaries on your desk, Check cool designed calender application in your cell phone for your period.


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* Request permission

WRITE_EXTERNAL_STORAGE
ONES uses the authority of WRITE_EXTERNAL_STORAGE to save data

READ_EXTERNAL_STORAGE
ONES uses the authority of READ_EXTERNAL_STORAGE to load data

GET_ACCOUNTS
ONES uses the authority of GET_ACCOUNTS to improve its web environment.
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Let's be with Once that always does the best to offer the best service :D
※ You can get a fast response if you send the question to '[email protected]' :)


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This service includes In-app Purchase items, and a separate fee will be charged for purchase.



Terms of Service : https://bit.ly/38zBlvj

Privacy Policy : https://bit.ly/3iqaZ3g
Updated on
08 Jan 2024

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info, App activity and App info and performance
Data isn’t encrypted
You can request that data be deleted

Ratings and reviews

4,4
23K reviews
Heather Pugh
15 August 2021
I've used this app for years, & keep coming back to it for its ease & convenience. However, I was forced to purchase a new device when my old device started green screening a few days ago. When I changed them over today it will not bring up my account. It says there's not an account registered to my email address. I've switched multiple devices in the past with no issue & as always I backed up my info prior to the switch. Please help. Otherwise, this is easily a 4star app.
2 people found this review helpful
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(주)넵튠
18 August 2021
Hello, this is Once Team :) First of all, we'd like to apologize for the inconveneince caused while using our service. Pelase tell us the account you have trouble retrieving your data to [email protected] .We'll do our best to retrieve your precious data. Thank you :)
Jayarie
30 March 2021
This app was great and sorta still is. My issue is the ads. We don't care if you show ads but it needs to be in a language we understand and easy to remove. The language and layout is different from English ads so I can't figure out where the close button is or what it's even advertising. I always have to close the app and reopen to get rid of it . I may have to find another app cause this is just inconvenient now.
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(주)넵튠
25 April 2018
Hello, this is Once Team :) First of all, we'd like to thank you for your interest in our service. Also, we really appreciate your valuable opinion :) We're always in the process of developing our service, so feel free to tell us your opinion. We'd be more than happy to hear from you. Thank you :)
Tiffany Ellzey
08 January 2022
Used to love this app, but when I switched phones I noticed it was showing a lot of non-English ads (possibly in Korean or Mandarin). Plus, my brand new phone was acting oddly glitchy. I suspected it had something to do with this app, so I uninstalled it. Sure enough, my phone stopped acting glitchy. There's something suspicious about this app, and I advise everyone to uninstall it. Definitely feel like it's engaging in some kind of data breaches. Play Store definitely needs to investigate this!
12 people found this review helpful
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(주)넵튠
10 January 2022
Hello, this is Once Team :) First of all, we'd like to thank you for your interest in our service, Seems like you didn't like our service. Tell us what you didnt' like about our service, so that we can improve our service! We'd be always happy to hear from you :) Thank you